Difference of two squares, staple diet for GCSE maths students, is first proposition in Carr’s book of magic and has ancient geometric roots in Euclid Book II.

# Author: jped

Mechanics 1, June 2007 paper, now written out and available at http://jped.co.uk/ExamBucket/examfiles/M1Sum07W.pdf

A rectangle which can be divided into a square and a smaller similar rectangle has length and breadth in the Golden Ratio

Back in the classroom after Easter for Mechanics 1 consolidation and revision.

Carr’s 626, in his magical book for Edwardian mathematical autodidacts, provides summary of general solutions for trigonometrical equations useful to STEP and A level students.

Friendly triangles – good visual method for memorising trig ratios of 30, 45 and 60 degree angles. Known for thousands of years as per the Babylonian tablet